/* $Xorg: eg31d.c,v 1.3 2000/08/17 19:47:38 cpqbld Exp $ */ /**** module eg31d.c ****/ /****************************************************************************** Copyright 1993, 1994, 1998 The Open Group All Rights Reserved. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. NOTICE This software is being provided by AGE Logic, Inc. under the following license. By obtaining, using and/or copying this software, you agree that you have read, understood, and will comply with these terms and conditions: Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose and without fee or royalty and to grant others any or all rights granted herein is hereby granted, provided that you agree to comply with the following copyright notice and statements, including the disclaimer, and that the same appears on all copies and derivative works of the software and documentation you make. "Copyright 1993, 1994 by AGE Logic, Inc." THIS SOFTWARE IS PROVIDED "AS IS". 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Title to this software shall at all times remain with AGE Logic, Inc. ****************************************************************************** eg31d.c -- DDXIE module for encoding g31d format Ben Fahy, AGE Logic, Oct 1993 XXX - this module should be merged with etiff2.c - the only difference is the way EOL's are coded. ******************************************************************************/ #include "fax.h" #define _G31D #include "fencode.h" #include "xiemd.h" #include "fetabs.h" /************************************************************************/ encode_g31d(state) FaxEncodeState *state; { /* stuff exchanged with state variable */ register int goal; register unsigned char *byteptr; register unsigned char *endptr; register int bitpos; register int width; register int stager; int rl; register int a0_color; G31DEncodePvt *epvt; /* stuff exchanged with private state variable */ register int index; register int nvals; register int *counts; register int nbits; int rlcode; int terminating; register int codelength; register int lines_coded=0; register int lines_to_code=0; int old_rl; if (state == (FaxEncodeState *) NULL) return(-1); /* set up initial bitstream for the very first output strip */ if (!state->bits.started) { if (state->strip_state != StripStateNew) { state->encoder_done = ENCODE_ERROR_StripStateNotNew; return(-1); } state->bits.byteptr = (unsigned char *)state->strip; state->bits.endptr = state->bits.byteptr + state->strip_size; /* record end of output strip */ state->bits.bitpos = 0; state->bits.started = 1; state->strip_state = StripStateInUse; } /* or, reset bitstream for a new output strip */ if (state->magic_needs) { if (state->strip_state == StripStateNew) { state->strip_state = StripStateInUse; state->bits.byteptr = (unsigned char *)state->strip; state->bits.endptr = state->bits.byteptr + state->strip_size; /* record end of output strip */ state->bits.started = 1; } else { /* no new strip?? But... I *need* more data! */ state->encoder_done = ENCODE_ERROR_BadMagic; return(-1); } state->magic_needs = 0; } localize_state(state); /*** Main Encoding Loop ***/ while (1) { switch(goal) { case ENCODE_FAX_GOAL_StartNewLine: /* every new line need to write an EOL. Should call it BOL,huh? */ if (epvt->align_eol) { /* advance bitpos to 4 + 8k, where k is an integer */ bitpos = 4 + 8*( (bitpos+3)>>3 ); } stager |= (EOL_CODE << (16-bitpos)); bitpos += EOL_BIT_LENGTH; goal = ENCODE_FAX_GOAL_FlushEOL; case ENCODE_FAX_GOAL_FlushEOL: if (byteptr >= endptr) { state->strip_state = StripStateDone; state->magic_needs = 1; save_state_and_return(state); } /* if here, we know it is safe to flush at least one byte */ *byteptr++ = (stager&0xff000000) >> 24; stager <<= 8; bitpos -= 8; if (bitpos >=8) { /* go around and flush some more */ break; } goal = ENCODE_FAX_GOAL_EOLWritten; if (lines_coded >= state->nl_tocode) { /* We have read the whole input strip, need more data */ save_state_and_return(state); } case ENCODE_FAX_GOAL_EOLWritten: /* every new line we need to compute its runlength data */ /* get the sequence of white and black run lengths */ nvals = encode_runs( state->i_lines[lines_coded], /* input data */ width, /* # of bits */ counts, /* where to put lengths */ state->radiometric, /* if 1, white is 1 */ width ); if (nvals < 0) { state->encoder_done = ENCODE_ERROR_EncodeRunsFailure; save_state_and_return(state); } a0_color = WHITE; index = 0; case ENCODE_FAX_GOAL_OutputNextRunLength: rl = counts[index++]; old_rl = rl; case ENCODE_FAX_GOAL_DeduceCode: nbits = deduce_code(a0_color,&rl,&rlcode,&terminating); /* should be a macro but for now, a function */ /* shift code over so it merges with stager contents */ stager |= (rlcode << (16-bitpos)); bitpos += nbits; if (bitpos >=8) { goal = ENCODE_FAX_GOAL_FlushStager; break; } if (terminating) { /* all done with this runlength */ if (index < nvals) { a0_color = ~a0_color; goal = ENCODE_FAX_GOAL_OutputNextRunLength; break; } else { goal = ENCODE_FAX_GOAL_FinishLine; break; } } /* go around the loop again */ goal = ENCODE_FAX_GOAL_DeduceCode; old_rl = rl; break; case ENCODE_FAX_GOAL_FlushStager: if (byteptr >= endptr) { state->strip_state = StripStateDone; state->magic_needs = 1; save_state_and_return(state); } /* if here, we know it is safe to flush at least one byte */ *byteptr++ = (stager&0xff000000) >> 24; stager <<= 8; bitpos -= 8; if (bitpos >= 8) { /* go around the loop again, trying to flush more */ break; } /* if here, we have flushed stager to the point there is */ /* at most a partial byte of data left in it. */ if (terminating) { /* all done with this runlength */ if (index < nvals) { a0_color = ~a0_color; goal = ENCODE_FAX_GOAL_OutputNextRunLength; break; } else { goal = ENCODE_FAX_GOAL_FinishLine; break; } } /* not done with this runlength yet */ goal = ENCODE_FAX_GOAL_DeduceCode; break; case ENCODE_FAX_GOAL_FinishLine: ++lines_coded; goal = ENCODE_FAX_GOAL_StartNewLine; break; default: state->encoder_done = ENCODE_ERROR_BadMagic; save_state_and_return(state); break; } /* end of switch(goal) in main decoding loop */ } /* end of main encoding loop */ } /************************************************************************/